Experiment: Hildebrandt Ruiz Lab_20180105_octane/nitrite_Chlorine radical_Ammonium sulfate_dry


Name: Hildebrandt Ruiz Lab_20180105_octane/nitrite_Chlorine radical_Ammonium sulfate_dry
Date: 2018-01-05

Hildebrandt Ruiz Lab

LHR Chamber

Experiment Set
Alkanes + Cl + NOx

Find SOA yield for octane + Cl under high NOx condition (NO2 injected). Investigate volatility behavior based on 2D thermograms.

Ammonium sulfate seed (0.01M, 150 mL) was injected using an aerosol generation system. Cl2 gas and NO2 gas were injected from their cylinders. 1 uL of octane was injected into a glass bulb and heated clean air was made to flow over it, carrying the volatilized octane into the chamber. After ~30 mins (sufficient mixing time), lights were turned on for 1 hour (12:24:09-13:24:17). 11.0 ug/m3 of SOA was formed, giving a mass yield of 0.16. This is Exp#2 in associated publication.

Additional Notes
In the ACSM .csv file, exp_time_ACSM=0 is the time at which UV lights are turned on. Traces labelled as "X_corr_S" have been corrected for particle phase wall losses based on SEMS volume data.

Experiment Details


  • Gas phase chemical reaction
  • Volatility and partitioning
  • Aerosol formation
Temperature: 25
Relative Humidity: 0
Seeded Experiment: Yes
Type of Seed: Ammonium sulfate
Initial Seed Concentration Value:
Seed Concentration Units:
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 0
Reaction type:
Oxidant Name: Chlorine radical
Initial Oxidant Concentration Value: 40.4 (parts_per_billion)
RO2 Main Fate: Not Sure
RO2 Lifetime: (Seconds)

Data Set plots
Choose a file: Choose the X-Axis:

Experiment Set Details

Name: Alkanes + Cl + NOx
Time format and units: CST time following format hh:mm AM/PM
Chlorine-initiated oxidation of n-Alkanes (C8-12) under high nitrogen oxides conditions was investigated. 12 experiments were conducted overall where secondary organic aerosol yields were determined, vapor and particle-phase product composition was studied (using FIGAERO-CIMS), and two-dimensional thermograms from the FIGAERO data were used to investigate volatility of products formed.


  • Dongyu S Wang University of Texas at Austin, now at Paul Scherrer Institute in Switzerland
  • Lea Hildebrandt Ruiz University of Texas at Austin


Principal investigator:

Lea Hildebrandt Ruiz
E-mail: lhr@che.utexas.edu
OrcID: 0000-0001-8378-1882

Data Manager:

Lea Hildebrandt Ruiz
E-mail: lhr@che.utexas.edu


Reactant Compound type Concentration Concentration units
octane (356)
  • Alkane
70 Microgram Per Cubic Meter
nitrite (946)
  • NOx
36 Parts Per Billion

2018_01_05_Oct_Cl_NO2_timeline.csv Timeline

Time (HH:MM) Event Description
9:00 Test

Light Flux Characterizations:
Particle Loss Characterizations:
Vapor Loss Characterizations:

Chamber Details

Name: LHR Chamber
Volume in cubic meters: 8.92
Shape: Rectangular Prism
Surface area in cubic meters: 26.4
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 5.0
Replacement date: 2018-06-15
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Oxidation
o3 background:
nox background:
Particle background in micrograms per cubic meter: < 10 counts/cm3
Air filtration method: NA
Mixing method: 0
Mixing method material:
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius): 5
Temparature range (max degrees celcius): 50
Humidity Control: No
Humidity Measurements Recorded: Yes
Relative humidity range (min percent): 0
Relative humidity range (max percent): 85
Particle experiment capability: 1
Lights: Yes
Light source type(s): UV-A Blacklight
Supplemental information:
Additional Notes: